Introduction and History

Special antenna bracket

Here's a special bracket made for the "mil" type antenna used on the 1 1/4 meter hub repeater that provides linking service for K.B.A.R.A. It was install improperly (kindly said) a year or two ago and was threatened against the weather elements of winter, so in May of 2007 a better bracket was built. Because of the special way the antenna's base was designed this required a separate crew to access the site and bring down the antenna and other parts with it. At the shop this was designed, built and re-installed the same day. The second crew ended up home about 11pm that night, however was happy from a successful and safe trip.

Shown here is the final installation at the site. Two 3/8" thick X 6" long "L" angle steel was welded onto a # 80, 2 3/8" OD pipe. These had holes drilled for the spacing of the 3/8 SAE threaded holes built into the antenna's base. Grade 5 bolts, 1" long were then fastened through the angles, with lock washers. These angles were then welded onto the pipe. One problem appeared, however. To finish up the welding the antenna was unbolted. Because of movement in cooling metal the holes drill did not line up with the antenna's base holes, when it was later remounted. To correct this problem one of the sides (angle) holes were make into "slots" for ease of fitting. This also made mounting the antenna a snap. Flat washers were also install on this side to provide a good surface area for the bolt heads. The N female connector at the base of the antenna has a "jumper" cable plugged into it, with the other (UHF-male) end connects into the end of the 1/2" (old style) LDF hard line. Instead of trying to tape around the base connector, a piece of PVC conduit pipe was run up inside the base, with a couple of hose clamps to keep it in place. A small piece of "U" channel was welded on the main pipe to level out this PVC pipe with the antenna's base.












This is the routing of the jumper cable to the main LDF hard line. The picture on the right is redundant, except to note, as off topic, the dramatic sensitivity of a digital camera. The above pictures where taken with the (automatic) flash, while this picture was taken a minute afterward with the flash turned off. It was evening, with the sun already had set about 20 minutes before. There is so much light sensitivity in this picture it almost looks like it was during the daytime!

These thumbnails came be greatly enlarged by clicking on the one(s) of interest. Be sure you have a fast internet connection, or you'll be waiting a while for it to appear.











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